CVE-2026-24559: Contact Form 7 HubSpot Data Disclosure

CVE-2026-24559 Overview

CVE-2026-24559 is a Sensitive Data Exposure vulnerability affecting the CRM Perks Integration for Contact Form 7 HubSpot WordPress plugin (cf7-hubspot). The vulnerability allows authenticated attackers to retrieve embedded sensitive data through improper handling of information sent to external services.

This vulnerability stems from CWE-201 (Insertion of Sensitive Information Into Sent Data), where the plugin improperly includes sensitive information in data transmissions. Attackers with low-level privileges can exploit this flaw to access confidential data that should not be exposed.

Critical Impact

Authenticated attackers can retrieve sensitive data embedded in plugin transmissions, potentially exposing user information, API credentials, or other confidential data processed through Contact Form 7 and HubSpot integrations.

Affected Products

• Integration for Contact Form 7 HubSpot plugin version 1.4.3 and earlier
• WordPress installations using the cf7-hubspot plugin
• Sites with Contact Form 7 to HubSpot integration functionality

Discovery Timeline

• January 23, 2026 - CVE-2026-24559 published to NVD
• January 26, 2026 - Last updated in NVD database

Technical Details for CVE-2026-24559

Vulnerability Analysis

This vulnerability belongs to the Sensitive Data Exposure category. The CRM Perks Integration for Contact Form 7 HubSpot plugin fails to properly sanitize or filter sensitive information before transmitting data to external services. This design flaw allows authenticated users with limited privileges to intercept or retrieve embedded sensitive data that should remain protected.

The attack can be performed over the network without user interaction, requiring only low-level authentication. While the vulnerability does not allow complete system compromise, it enables unauthorized access to confidential information and potential modification of limited data within the plugin's scope.

Root Cause

The root cause is CWE-201: Insertion of Sensitive Information Into Sent Data. The plugin's data handling mechanism fails to properly segregate or sanitize sensitive information before including it in outbound communications. This results in confidential data being embedded in transmissions where it can be accessed by authenticated users who should not have visibility into such information.

The vulnerability exists because the plugin does not implement adequate access controls or data filtering when preparing form submissions for transmission to HubSpot's API, allowing sensitive embedded data to be retrieved by users with minimal privileges.

Attack Vector

The attack vector is network-based and requires low-privilege authentication. An attacker who has authenticated to the WordPress site with minimal permissions can exploit this vulnerability to retrieve sensitive data embedded within the plugin's data transmission mechanisms.

The exploitation flow involves:

1. Authenticating to the WordPress installation with a low-privilege account
2. Interacting with the Contact Form 7 HubSpot integration functionality
3. Intercepting or accessing the data being sent to external services
4. Extracting sensitive information that should not be visible to the attacker's privilege level

This vulnerability does not require user interaction and can be exploited consistently once an attacker has established authenticated access.

Detection Methods for CVE-2026-24559

Indicators of Compromise

• Unusual access patterns to Contact Form 7 HubSpot plugin configuration pages by low-privilege users
• Unexpected API requests or data retrievals from the cf7-hubspot plugin directory
• Log entries showing authenticated users accessing plugin data outside their normal workflow
• Anomalous outbound traffic patterns to HubSpot API endpoints

Detection Strategies

• Monitor WordPress audit logs for low-privilege user access to plugin settings and data transmission functions
• Implement file integrity monitoring on the cf7-hubspot plugin directory
• Review web server access logs for suspicious requests to plugin endpoints
• Deploy WordPress security plugins that track plugin-level activity

Monitoring Recommendations

• Enable detailed logging for the Contact Form 7 HubSpot integration plugin
• Configure alerts for unusual data access patterns by non-administrator users
• Monitor outbound API traffic to HubSpot for anomalous request volumes or content
• Regularly audit user permissions to ensure principle of least privilege

How to Mitigate CVE-2026-24559

Immediate Actions Required

• Update the Integration for Contact Form 7 HubSpot plugin to the latest available version beyond 1.4.3
• Audit user accounts and remove unnecessary privileges from low-level users
• Review recent plugin activity logs for signs of exploitation
• Consider temporarily disabling the plugin until a patched version is confirmed

Patch Information

The vulnerability affects Integration for Contact Form 7 HubSpot plugin versions through 1.4.3. Users should check for updates from CRM Perks and apply the latest security patch when available. For detailed vulnerability information, refer to the Patchstack Vulnerability Analysis.

Workarounds

• Restrict plugin access to administrator-level users only until a patch is applied
• Implement additional access controls at the web server level for plugin directories
• Consider using a Web Application Firewall (WAF) to monitor and filter suspicious requests
• Temporarily disable the Contact Form 7 HubSpot integration if it is not business-critical

# WordPress CLI - Check current plugin version
wp plugin list --name=cf7-hubspot --fields=name,version,status

# Update plugin to latest version when patch is available
wp plugin update cf7-hubspot

# Temporarily deactivate plugin if immediate patching is not possible
wp plugin deactivate cf7-hubspot